3121311155777 has 2 divisors, whose sum is σ = 3121311155778. Its totient is φ = 3121311155776.

The previous prime is 3121311155773. The next prime is 3121311155791. The reversal of 3121311155777 is 7775511131213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2650901729281 + 470409426496 = 1628159^2 + 685864^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121311155777 - 2² = 3121311155773 is a prime.

It is not a weakly prime, because it can be changed into another prime (3121311155773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560655577888 + 1560655577889.

It is an arithmetic number, because the mean of its divisors is an integer number (1560655577889).

Almost surely, 2^{3121311155777} is an apocalyptic number.

It is an amenable number.

3121311155777 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121311155777 is an equidigital number, since it uses as much as digits as its factorization.

3121311155777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154350, while the sum is 44.

The spelling of 3121311155777 in words is "three trillion, one hundred twenty-one billion, three hundred eleven million, one hundred fifty-five thousand, seven hundred seventy-seven".